Applied magnetic field rejects the coating of ferromagnetic carbon from the surface of ferromagnetic cobalt: RAPET of CoZr2(acac)2(OiPr)8.

The journal of physical chemistry. B · 2005 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3575

Study snapshot

PublicationThe journal of physical chemistry. B · 2005

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

We present the results of the RAPET (reaction under autogenic pressure at elevated temperatures) dissociation of CoZr(2)(acac)(2)(O(i)Pr)(8) at 700 degrees C in a closed Swagelok cell under an applied magnetic field of 10 T. It produces a mixture of carbon-coated and noncoated metastable ZrO(2) nanoparticles, bare metallic Co nanoparticles, and bare carbon. The same reaction in the absence of a magnetic field produces spherical Co and ZrO(2) particles in sizes ranging from 11 to 16 nm and exhibiting, at room temperature, metastable phases: fcc for cobalt and a tetragonal phase for zirconia. The metastable phases of Co and ZrO(2) are manifested because of a carbon shell of approximately 4 nm thickness anchored to their surfaces. The effect of an applied magnetic field to synthesize morphologically different, but structurally the same, products is the key topic of the present paper.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

RAPET dissociation at 700C under an applied 10 T magnetic field produced a mixture including carbon-coated and noncoated metastable ZrO2 nanoparticles, bare metallic Co nanoparticles, and bare carbon. The same reaction without a magnetic field produced spherical Co and ZrO2 particles (111 nm) with metastable phases attributed to an ~4 nm carbon shell anchored to particle surfaces; the applied field yielded morphologically different but structurally similar products.

Outcomes measured

nanoparticle morphology/coating (carbon shell presence)
nanoparticle composition/products formed
nanoparticle size (nm range)
nanoparticle crystal phase (fcc Co; tetragonal ZrO2)

Limitations

No biological/health outcomes assessed (materials synthesis study)
Magnetic field exposure parameters beyond field strength (e.g., time profile) not stated in abstract
Sample size/number of experiments not reported in abstract

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "applied magnetic field (laboratory)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "nanoparticle morphology/coating (carbon shell presence)",
    "nanoparticle composition/products formed",
    "nanoparticle size (nm range)",
    "nanoparticle crystal phase (fcc Co; tetragonal ZrO2)"
  ],
  "main_findings": "RAPET dissociation at 700\u0000C under an applied 10 T magnetic field produced a mixture including carbon-coated and noncoated metastable ZrO2 nanoparticles, bare metallic Co nanoparticles, and bare carbon. The same reaction without a magnetic field produced spherical Co and ZrO2 particles (11\u0013\u00161 nm) with metastable phases attributed to an ~4 nm carbon shell anchored to particle surfaces; the applied field yielded morphologically different but structurally similar products.",
  "effect_direction": "unclear",
  "limitations": [
    "No biological/health outcomes assessed (materials synthesis study)",
    "Magnetic field exposure parameters beyond field strength (e.g., time profile) not stated in abstract",
    "Sample size/number of experiments not reported in abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "RAPET",
    "autogenic pressure",
    "applied magnetic field",
    "10 T",
    "nanoparticles",
    "cobalt",
    "zirconia",
    "carbon coating",
    "metastable phases",
    "Swagelok cell"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1021/jp0445728
PubMed: 16851674

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